Received: 3 January 2019
Accepted: 13 February 2019
First Online: 28 February 2019
Ethics approval and consent to participate
: The study was approved by the National Ethics Committee for Health Research, Ministry of Health, Lao PDR (No.092/NECHR). The purpose of study was explained before the interview, and informed consent was the obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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